Surgical chair



(No Model.) G WEBER o SURGICAL GHAIR. No. 31.3,6/36. Patented Mar. 10f1885 WITNESSES {"J' lIBHVTENIOR www fmw@ 1 l B Y Ummm* ATTORNEYS.

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UNrrEn GEORGE VEBER, OF BROOKLYN, NEV YORK.

SURGICAL CHAIR.

SPECIFICATION forming part of Letters Patent No. 313,636, dated March10, 1885.

` Application filed February 29, 1884. (No model.)

To all whom it may concern,.-

Be it known that I, GEORGE WEBER, of Brooklyn, Kings county, New York,have invented a new and Improved Surgical Chair, of which the followingis a full, clear, and exact description.

The object of my invention is to provide a new and improved surgicalchair, which can be readily adjusted in height and locked in position,and the leg and back rests of which chair can also be easily adjustedand locked in place.

llhe invention consists in the combination, with a chair seat and base,of crossed pivoted legs, a segmental rack held on the pivot of the legs,and of a pawl pivoted to the seat and resting on the rack.

The invention also consists in a clip hung by a pivot or wedge passinginto a longitudinal slot in the seat side bar, which clip is'provided atits lower end with a catch adapted to engage with a rack on the bottomedge of the seat side bar. The lower end of the clip is pivoted to abracebar pivoted to a leg-rest, back-rest, or armrest for holding` thesaid rest in place.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the iigures.

Figure l is a side view of my improved surgical chair. Fig. 2 is anenlarged side view of parts of the sanne, other parts being shown insection. Fig. 3 is. an enlarged detail side view of the locking device,the face-plate being removed. Fig. 4 is a cross-sectional view ofthesame on the line x a0, Fig. 3. Fig. 5 is a crosssectional View on theline y y, Fig. 2. Fig. 6 is a side view of a modification of themechanism for raising the chair and locking it in place.

At each side of the chair the seat A is sup ported by two crossed legs,B, pivoted to each at their intersection by a pivot, a, or crossrod, thesaid legs being pivoted to the seatfra-me A and to the base-frame O. Theinner ends of thelegs-that is, the upper end of one leg and the lowerend of the other-are provided with pins b, which project into'the 1on-5o gitudinal slots o in the end of frame A and base C.

On each end of the cross-rod a is secured a disk, D, on the innersurface ot' which aourved rack, E, is formed, on the edge of which apin, F', rests, which is secured in the free end ot' a pawl-lever, F,pivoted to the front ofthe corresponding side of the seat-frame.

Abovepart oftheratchet-plateEasegmental track-piece, G, is arranged sucha distance from the edge of the rack that the pin F can pass between thetrack-piece and the edge of the `track-plate. The track-piece isprovided at one end with a tapering pivoted switchtongue, H, the freeend of which rests on the edge of the raclrplate E. Alever, J, ispivoted on the cross-rod a, and a short distance from t-he pivot it isprovided with a downwardly-projecting arm, J', pivoted to the upper endof a bar or rod, K, pivoted to the basefraine G. lf desired, the lever Jcan be se- 7o cured on the disk D, and the disk D pivoted at its rim tothe bar or rod K, as shown in Fig. 6. The hinged back-rest L is providedat each end with au arm-rest formed of the bars M, pivoted to theback-rest side bars and to the upper ends of bars N, pivoted to theseat-fraine side bars. Each seat-frame I side bar is provided with alongitudinal slot,

O, under which a rack, o, is formed in the bottoni edge of theseat-fra1ne side bar. A

clip-plate, P, is provided with a wedge-piece,

p, at its upper end, which wedgeepiece en tends into the slot O. .and onthe lower end of' the clip-plate a catch, Q, is formed, which is adaptedto engage with the teeth of the rack o. A connecting piece or brace, R,has its upper end pivoted to the bar-N and its lower end to the lowerend of the clip P. The legrest S ispivoted to the end of the seatfra1ne,

and is provided at its lower end with :a pivoted foot-rest. Each sidebar of the leg-rest is con` nected by a pivoted bar, T, with aclip-plate,

P, arranged and constructed in the manner described.

rEhe chair is adjusted in the following manner: If the seat is to beraised, the outer end oi' the lever J is depressed, thereby moving thecross-rod a lupward and toward the front to the position shown in Fig.l. The tend- IOO ency of the legs B will be to collapse and cause theseat to loe depressed unless a locking meansis employed.

The pin F onthe end of the pawl-lever F slides over the Vedge of the lthe clip and prevent it from assuming asufratchet-plate E as the seat isbeing raised, and necessarily catches on the several teeth of the same,and if the lever J is released the seat is locked in place.

To lock the seat in its highest position the pin F is caused to engagethe right-hand notch, as shown in Figs. 1, 3, and 6. If the seat werenow lowered, the rod a would-be moved farther downward and backward fromthe pin F, and it could be made to engage with any one of the severalnotches on ratchetplate E. Of course when the lever J is depressed inthe act of raising the seat the rear parts of -legs B slide forward,thus bringing the rod a upward and toward the Afront, as abovedescribed. The seat can thus be locked at any desired elevation. If theseat is to be lowered, the lever J is depressed until the pin F arrivesat the end of the ratchet-teeth,when the seat will be raised as high'aspossible. The pin F raises the switch-tongue H and Apasses to the uppersurface of the same, and,

if the lever J is released,slides over the trackplate G in the inversedirection of the arrow a', the leverJswinging upward and the crossrod aand the seat moving downward. Ifthe seat is raised as high as possible,the pin F slips from under the tongue H and raises it, and then slidesback over the curved trackplate G, whereby the chair will be lowered. lf

. the chair is to be lowered when partly raised,

the pawl-lever F is raised to disengage the pin F from the teeth of therack-pl ate E, thus permitting the seat to descend. Ifthe back-rest ismoved forward, the locking device moves with it and locks the back-restautomatically as soon as it is released, so that for adjusting theback-rest in a more vertical position all that is necessaay is to movethe back-rest for- ;ward; but if the back-rest is to be moved back.

the bar R must be moved in the direction of the arrow b', Fig. 2, todisengage the catch Q from the rack o. As soon as the bar R is releasedit swings back and locks the backrest in place. The back-rest can beheld at any desired inclination. Theleg-rest S can be adjusted inasimilar manner. lf the chair is not in use, the leg-rest S can befolded over the sea-t and the back-rest over the leg-rest, as shown indotted lines in Fig. l.V lf the legrestis folded inthemanner described,its locking device, which is the same as the locking device for theback-rest, is iirst moved in the direction of the arrow b', andis thenmoved in the inverse direction of the arrow b; but when moved intheyinverse direction of the arrow b the clip-piece P must be held insuc-l1 a direction that its catch cannot engage with the rack o. This isaccomplished by means of a pin, tt, projecting from the face of thepivoted bar T in front ofthe lower end of clip-piece P, so that when theleg-rest and bar T are being brought to the positionshown by dottedlines in Fig. 2 the said pin will form a bearing for ciently verticalposition to bring its catch into engagement with the teeth 0. In thereturn movement of the clip, leg-rest, and bar Tthe pin does not act atall.

Having thus described my in vention, I claim as new and desire to secureby Letters Patentl. In a chair, the combination, with a seat and a base,of crossed pivoted legs, a segmental rack held on the pivots of the legsa pawl pivoted on the seat, and a lever connected with the pivot orcross-rod of thelegs for raising the same,"and a fulcrumconnectionbetween said lever and base, substantially as herein shown anddescribed.

2. In a chair, the combination, with a seat and base, of crossed pivotedlegs, a segmental rack held on the pivot of the legs, a curved track-barheld above the rack, a switch or tongue pivoted at the end of thetrack-bar, and

a pawl pivotedto the seat, a lever secured to pivot-rod ct, and afulcrum-connection between said lever and the base, substaptially asherein shown and described.

3. In a chair, the combinatiomwith the base C and seat A, of the crossedpivoted legs B, the disk D on the pivot ofthe legs, the ratchet-disk Eon the disk D, thelever J, having an arm, J', the connecting-rod K.pivoted to the arm J, and the base C,'substautially as herein shown anddescribed.

4. ln achair, thecombination, with the seat Y side bar, A, having alongitudinal slot, O, and a rack, o, in the bottom edge, of the clip P,having the catch Q on the lower end ofthe same, and the wedge p in theupper end of the same projecting into the slot O, and ol'a bracebarpivoted to the lower end of the clip P, substantially as herein shownand described.

5. In a chair, the combination, with a seat side bar having alongitudinal slot,and below it a rack on the bottom edgegpf the bar, ofa clip-plate provided at its uppei1 end with a projection extending intothe slot in the seat side bar, and a catch on its lower end, which catchis adapted to engage with the rack, and of a brace-bar pivoted to thelower end of the clip and connected with a back-rest or equivalentmoving part, substantially as herein shown and described.

6. ln a chair, the combination, with a seat side bar, A, having alongitudinal slot, O, and rack o, of the leg-rest S, pivoted to the sidebars, clip P, )rovided ou its upper end with a'projection extending intothe slot O, and a catch on its lower end engagingthe rack o, thebrace-bar T, pivoted to the leg-rest and to the lower end of the clip,and a pin, t, on said brace-bar in front of the lowerpart ofthe clip,substantially as and for the purpose set forth.

GEORGE WEBER.

IOO

